Why does a ray of light, incident through centre of curvature of a spherical
mirror, retrace its path?
Solution
the ray of light incident through centre of curvature retrace its path, because the angle between normal and incident ray is 0 degree.
Thus using snell's law, we can conclude that angle of refraction will be 0 degree.
Thus as a result the reflected ray bounce back to the same medium with 0 degree angle of reflection and refracted ray retraces the path in opposite direction.
the ray of light incident through centre of curvature retrace its path, because the angle between normal and incident ray is 0 degree.
Thus using snell's law, we can conclude that angle of refraction will be 0 degree.
Thus as a result the reflected ray bounce back to the same medium with 0 degree angle of reflection and refracted ray retraces the path in opposite direction.